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PESTS AND DISEASES OF FORESTRY IN NEW ZEALAND

Symptoms observed in June, tree age over fifteen years

Physiological needle blight occurs from June to November. Symptoms are generally seen in trees over 15 years old.

Needles

Red, then red-brown, then grey. Needles retained. Wilt common at late stage of disease development.

Incedence and severity

Localised distribution, very high incidence in affected parts of a stand.

 

Close up view of black banding, within a larger yellowish or khaki/olive coloured band, typical of the onset of RNC

Red needle cast occurs from April to October on trees of all ages, but generally those over 3 years old.

Needles

Oily green band, then yellow, then red. Needles detach readily. Resin blobs are sometimes seen at the needle base.

Incidence and severity

Localised/general distribution, almost every tree in affected parts of a stand.

 

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